package com.heima.app.gateway.filter;

import com.heima.app.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //1.判断请求是否为登录请求
        if (request.getURI().getPath().contains("/login")){//是登陆请求,放行
            return chain.filter(exchange);
        }
        //不匹配就要匹配token
        String token = request.getHeaders().getFirst("token");//从request里面那token信息
        if (StringUtils.isBlank(token)){//token为空
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
           return response.setComplete();//代表结束,不会往后执行
        }

        try {
             Claims claims = AppJwtUtil.getClaimsBody(token);
            int result = AppJwtUtil.verifyToken(claims);
            if (result==1 ||result==2 ){//token过期
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
               return response.setComplete();//代表结束,不会往后执行
            }
            String id = claims.get("id").toString();
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> httpHeaders.add("userId", id)).build();
            exchange.mutate().request(serverHttpRequest).build();

        } catch (Exception e) {
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
       return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
